How do you distinguish between Pinky and the Brain in costume?

Pinky is taller with larger, blue-rimmed eyes, a slight overbite, and a goofy expression. Brain is shorter, has a massive forehead, a perpetual scowl, and often carries blueprints or lab equipment.

What is the easiest DIY way to make the ears?

Cut large teardrop shapes out of stiff white felt, cut slightly smaller shapes out of pink felt, glue them together, and hot-glue them to a cheap white or pink headband.

Is this costume warm enough for cold weather?

Yes, using a fleece jumpsuit or sweatpants as the base makes this an incredibly warm and cozy option for chilly Halloween nights.

AI-generated example

Pinky and the Brain Costume

Are you thinking what I'm thinking? Conquer the world in style.

Pinky and the Brain are the iconic genetically spliced lab mice from the hit 90s animated series Animaniacs. This look is a massive hit for couples and best friends who want a nostalgic, funny, and highly recognizable costume. The outfits consist of white mouse jumpsuits or matching white apparel paired with oversized pink ears, tails, and distinct facial features.

Difficulty: Medium
Time: ~45 min
Budget: $30–90

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Pinky and the Brain costume — Example look · AI-generated

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What you need for a Pinky and the Brain costume

Short on time? Buy it ready-made

Spirit Halloween sells the complete Pinky and the Brain costume — one box instead of 6 pieces.

Shop Pinky and the Brain at Spirit ↗

White hooded jumpsuit
A soft, plush white one-piece jumpsuit with a front zipper, serving as the base mouse body.
DIY: Wear a plain white oversized hoodie and matching white sweatpants.
Amazon
Oversized pink and white mouse ears
Large felt or plush mouse ears attached to a headband; Brain's ears are wider and rounder, while Pinky's are taller.
DIY: Cut large ear shapes out of pink and white felt and glue them to a plain plastic headband.
Amazon
Pink mouse nose
A small pink foam nose or face paint to create the classic cartoon mouse snout.
DIY: Use pink face paint or cosmetics to draw a round pink circle on the tip of your nose.
Amazon
White gloves or mitts
Simple white cotton or fleece gloves to mimic the characters' cartoon hands.
DIY: Use plain white winter gloves or white socks worn over your hands.
Amazon
Long pink mouse tail
A thin, bendable pink wire tail covered in fabric, pinned to the back of the jumpsuit.
DIY: Wrap pink yarn or pink felt around a flexible wire hanger and safety pin it to your pants.
Amazon
Brain's beaker or blueprint prop
A plastic laboratory beaker filled with colored liquid or a rolled-up blueprint for world domination.
DIY: Roll up a piece of blue construction paper and draw white grid lines on it.
Amazon

Rather not assemble it? See ready-made Pinky and the Brain costumes at Spirit Halloween ↗

How to put it together

1
Put on the white hooded jumpsuit or your matching white sweat suit base.
2
Attach the long pink mouse tail to the lower back of the jumpsuit using a heavy-duty safety pin.
3
Slip on the white cotton gloves, tucking the sleeves of the jumpsuit into the gloves for a seamless look.
4
Place the oversized mouse ears headband securely on your head, pulling the hood of the jumpsuit up behind the ears if using a hooded version.
5
Apply the pink nose makeup or strap on the foam mouse nose.
6
Grab your character-specific prop: a blueprint or beaker for Brain, or a silly expression and perhaps a fake piece of cheese for Pinky.

Makeup & hair

Keep hair tucked away under the hood or headband. Use pink face paint to color the tip of your nose, and use black eyeliner to draw three simple whiskers on each cheek.

Pinky and the Brain for couples, groups, kids & more

couples: One person dresses as the tall, goofy Pinky (with overbite teeth) and the other as the short, angry Brain (with a furrowed brow).
group: Add other Acme Labs characters, or have friends dress as lab scientists in white coats.
kids: Use a simple white fleece onesie with felt ears sewn onto the hood for a warm, comfortable kid's outfit.
Plus size: An oversized white fleece union suit provides a comfortable, loose fit for all body types.
pet: A simple white dog or cat sweater paired with a lightweight pink felt ear headband.

Tips

Brain should practice a permanent scowl, while Pinky should keep a wide, goofy grin to stay in character.
If you are doing the couples version, the person playing Brain can wear a slightly oversized headpiece or use makeup to emphasize a large forehead.
Wear comfortable white sneakers since you will be walking around planning to take over the world all night.

Pinky and the Brain costume FAQ

How do you distinguish between Pinky and the Brain in costume?: Pinky is taller with larger, blue-rimmed eyes, a slight overbite, and a goofy expression. Brain is shorter, has a massive forehead, a perpetual scowl, and often carries blueprints or lab equipment.
What is the easiest DIY way to make the ears?: Cut large teardrop shapes out of stiff white felt, cut slightly smaller shapes out of pink felt, glue them together, and hot-glue them to a cheap white or pink headband.
Is this costume warm enough for cold weather?: Yes, using a fleece jumpsuit or sweatpants as the base makes this an incredibly warm and cozy option for chilly Halloween nights.

Did you know? Pinky and the Brain first appeared as recurring characters on Animaniacs in 1993 before getting their own dedicated spin-off series produced by Steven Spielberg.